Monel 400 Flange (UNS N04400)
Monel 400 Flange Specifications:
- Grade: Monel 400
- UNS Number: N04400
- Werkstoff Number: 2.4360
- Standards: ASTM B564, ASME SB564
- Types: Slip-On, Weld Neck, Blind, Socket Weld, Threaded, Lap Joint, and Orifice Flanges
- Size Range: 1/2" to 60"
- Pressure Class: 150# to 2500#, PN6 to PN64
Monel 400 Chemical Composition:
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 28.0 - 34.0 |
| Iron (Fe) | 2.5 max |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 0.5 max |
| Carbon (C) | 0.3 max |
| Sulfur (S) | 0.024 max |
Monel 400 Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | 550 MPa min |
| Yield Strength | 240 MPa min |
| Elongation | 30% min |
| Hardness | 65 Rockwell B |
Monel 400 Physical Properties:
| Property | Value |
|---|---|
| Density | 8.80 g/cm³ |
| Melting Point | 1350-1400°C |
| Thermal Conductivity | 21.8 W/m·K |
| Electrical Resistivity | 0.51 µΩ·m |
Possible Alternative Grades:
| Grade | Description |
|---|---|
| Monel K500 | Higher strength, similar corrosion resistance |
| Inconel 625 | Superior oxidation and corrosion resistance |
| Hastelloy C276 | Excellent resistance to acids |
Chemical Formula:
Monel 400 primarily consists of Nickel (Ni) and Copper (Cu) with minor additions of iron, manganese, and other elements.
Grade Specification Comparison:
| Standard | Monel 400 | Monel K500 | Inconel 625 |
|---|---|---|---|
| Tensile Strength (MPa) | 550 | 965 | 860 |
| Yield Strength (MPa) | 240 | 690 | 414 |
| Hardness (Rockwell B) | 65 | 28 (C) | 88 (B) |
Corrosion Resistance:
Monel 400 flanges exhibit exceptional resistance to seawater, hydrofluoric acid, sulfuric acid, and alkalis. It is highly resistant to stress corrosion cracking and pitting in marine environments.
Heat Resistance:
Monel 400 maintains its strength and corrosion resistance up to 537°C. It can resist oxidation and scaling in high-temperature applications but is not recommended for prolonged exposure to temperatures above 600°C.
Heat Treatment:
Monel 400 is generally supplied in the annealed condition, enhancing its ductility and machinability. Annealing is done at temperatures between 926°C and 1038°C followed by rapid cooling.
Welding:
Monel 400 can be welded using conventional welding methods such as GTAW, GMAW, and SMAW. Filler metals of matching composition like Monel 60 are recommended to ensure corrosion resistance and strength.
Fabrication:
Monel 400 can be easily fabricated using standard machining processes. It requires sharp tools and slow speeds due to its tendency to work hard. The alloy can be hot and cold-formed with suitable precautions.
Applications:
- Marine engineering: Valves, pumps, shafts
- Chemical and hydrocarbon processing equipment: Equipment used in chemical processing and hydrocarbons
- Heat exchangers and condensers: Used in various heat transfer applications
- Oil & gas extraction and processing: Equipment for oil and gas extraction
- Seawater equipment: Equipment used in marine and seawater applications
- Acid production and storage equipment: Equipment for handling and storing acids